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2.0
Jun 30, 2018
06/18
by
Samuel Beaulieu; Etienne Bloch; Lou Barreau; Antoine Comby; Dominique Descamps; Romain Géneaux; Francois Légaré; Stéphane Petit; Yann Mairesse
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We present a novel time- and phase-resolved, background-free scheme to study the extreme ultraviolet dipole emission of a bound electronic wavepacket, without the use of any extreme ultraviolet exciting pulse. Using multiphoton transitions, we populate a superposition of quantum states which coherently emit extreme ultraviolet radiation through free induction decay. This emission is probed and controlled, both in amplitude and phase, by a time-delayed infrared femtosecond pulse. We directly...
Topics: Atomic Physics, Physics
Source: http://arxiv.org/abs/1701.06352
2
2.0
Jun 29, 2018
06/18
by
Antoine Comby; Samuel Beaulieu; Martial Boggio-Pasqua; Dominique Descamps; Francois Légaré; Laurent Nahon; Stéphane Petit; Bernard Pons; Baptiste Fabre; Yann Mairesse; Valérie Blanchet
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Unravelling the main initial dynamics responsible for chiral recognition is a key stepin the understanding of many biological processes. However this challenging task requires a sensitive enantiospecic probe to investigate molecular dynamics on their natural femtosecond timescale. Here we show that, in the gas phase, the ultrafast relaxationdynamics of photoexcited chiral molecules can be tracked by recording Time-ResolvedPhotoElectron Circular Dichroism (TR-PECD) resulting from the...
Topics: Chemical Physics, Physics
Source: http://arxiv.org/abs/1611.06226
3
3.0
Jun 29, 2018
06/18
by
Samuel Beaulieu; Seth Camp; Dominique Descamps; Antoine Comby; Vincent Wanie; Stéphane Petit; François Légaré; Kenneth J. Schafer; Mette B. Gaarde; Fabrice Catoire; Yann Mairesse
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We investigate the role of excited states in High-order Harmonic Generation by studying the spectral, spatial and temporal characteristics of the radiation produced near the ionization threshold of argon by few-cycle laser pulses. We show that the population of excited states can lead either to direct XUV emission through Free Induction Decay or to the generation of high-order harmonics through ionization from these states and recombination to the ground state. By using the attosecond...
Topics: Atomic Physics, Physics
Source: http://arxiv.org/abs/1603.07905
2
2.0
Jun 30, 2018
06/18
by
Amélie Ferré; David Staedter; Frédéric Burgy; Michal Dagan; Dominique Descamps; Nirit Dudovich; Stéphane Petit; Hadas Soifer; Valérie Blanchet; Yann Mairesse
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Strong field transient grating spectroscopy has shown to be a very versatile tool in time-resolved molecular spectroscopy. Here we use this technique to investigate the high-order harmonic generation from SF6 molecules vibrationally excited by impulsive stimulated Raman scattering. Transient grating spectroscopy enables us to reveal clear modulations of the harmonic emission. This heterodyne detection shows that the harmonic emission generated between 14 to 26 eV is mainly sensitive to two...
Topics: Physics, Chemical Physics, Atomic Physics
Source: http://arxiv.org/abs/1403.2476
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14
Jun 28, 2018
06/18
by
Olga Smirnova; Yann Mairesse; Serguei Patchkovskii
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Chiral discrimination with high harmonic generation (cHHG method) has been introduced in the recent work by R. Cireasa et al ( Nat. Phys. 11, 654 - 658, 2015). In its original implementation, the cHHG method works by detecting high harmonic emission from randomly oriented ensemble of chiral molecules driven by elliptically polarized field, as a function of ellipticity. Here we discuss future perspectives in the development of this novel method, the ways of increasing chiral dichroism using...
Topics: Quantum Physics, Optics, Chemical Physics, Physics, Atomic Physics
Source: http://arxiv.org/abs/1508.02890